社会资本的效用分析：以对城市居民普遍信任的影响为例

摘要

Social capital affects individuals’ activities and whether achievement of goals.But the curva-ture of this affecting manner is unknown.This paper finds that social capital has a decreasing marginal effect on urban people’ s generalized trust.As social capital increases, the generalized trust level goes up at low so-cial capital zone;but is leveled at high social capital zone.This finding betters off individuals’ activities and sheds light on how to construct social network and measure social capital by those policy makers.%社会资本在个体行动和目标的达成上具有重要的影响，但这种影响是线性关系还是曲线关系却鲜有研究。本研究发现，社会资本对城市居民的普遍信任具有边际效用型的曲线关系，亦即，随着社会资本的增长，其对普遍信任的效用增加到一定程度后便趋于平缓。这个发现对行动者及政策决定者在有关社会关系建构和社会资本投资的考量时具有一定的参考价值。